(CNN) — Quick. Think of a white supremacist group.
What comes to mind? The Ku Klux Klan during the 1920s? Maybe the Nazis in World World II?
Hundreds of white supremacist groups are active in the United States today and are experiencing a kind of resurgence.
They are in the spotlight this week in the wake of a deadly shooting at a Sikh temple outside Milwaukee. Authorities have said they are looking into whether the alleged gunman, who was killed, had ties to a white supremacist group.
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